Diamond Dust Zone Badnik 1

From Sonic Retro

A mobile snowman with a snowball cannon embedded in its hat, this badnik is one of the zone's more dangerous opponents. They slide around on ice-covered floor sections, following unpredictable routes and periodically spewing out snowballs in a half-circle. Sonic must take care and time a spin jump or spin roll tactically to destroy the enemy and make Flickies' Island a slightly less dangerous place. The organic battery power source, a Flicky, pops out frozen in a block of ice, which can actually be quite convenient - it stops them wandering off the moment they taste freedom.

While this was the first snowman-themed badnik in the Sonic games, similar robots have followed: